Steam-boiler.



No. 632,589. Patented Sept. 5, I899.

' .1. SANDDUIST.

STEAM BOILER.

(Application filed Nov. 29, 1898) (No Medal.) 2 Sheets-Sheef I.

40 Z4 Z0 Z7 No. 632,589. Patented Sept. 5, I899.

J. SANDOUIST.

STEAM BCHLER.

Application filed Nov. 29, 1898.)

2 Shee tsSheet 2.

(No Model.)

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NIT-ED STATES PATENT OFFICE.

JOHN SANDQUIST, OF GOKATO, MINNESOTA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 632,589, dated September 5, 1899.

Ap li ati filed November 29, 1898. Serial No. 697,785. (No model.)

To all whom it may concern:

Be it known that 1, JOHN SANDQUIST, a citizen of the United States, residing at Ookato, in the county of Wright and State of Minnesota, have invented a new and useful Steam- Boiler, of which the following is a specification.

My invention relates to improvements in steam-boilers especially adapted for use as a portable structure, such as in connection with traction-engines and railway-locomotives.

One object of the invention is to prevent the crown-sheet of the return connection chamber from becoming dry due to the evaporation of water from the boiler in the process of generating steam or the changing level of the water in the boiler, thus reducing the wear on the boiler andobviating the liability of the crown-sheet from wearing out.

A further object of the invention is to provide means by which the feed-water may be heated preliminary to'its introduction into the tube-chamber of the boiler, thus overcoming the arrestation of steam generation by the injection of cold feed-water into the boiler. A further object is to provide means by which the water in the crown-sheet chamber may change its level independently of the water in the tube-chamber when the boiler assumes different angles or positions in its transit over a field or a track, whereby the proper supply of water is maintained in the crown-sheet chamber for the protection of the crown-sheet from the effects of heat which circulates through the boiler.

A further object is to establish uniform pressure throughout the interior of the boiler, to provide for the collection of mud from the feed-water before it passes to the interior of the boiler, and to enable the chamber and the tube and head sheets to be cleansed conveniently from accumulations of mud and sediment.

With these ends in view the invention consists in the novel combination of elements and in the construction and arrangement of parts, which will be hereinafter fully de-' scribed and claimed.

To enable others to understand the invention, I have illustrated a preferred embodiment thereof in the accompanying drawings, forming a part of this specification, and in which- Figure 1 is a longitudinal sectional elevation through a steam-boiler constructed in accordance with my invention, the dotted lines representing the level of the water in the boiler under the difierent positions due to changes in the grade. Fig. 2 is an elevation looking at one end of the boiler. Fig. 3 is a vertical transverse section through the crownsheet of the return connection and the waterchamber which surrounds the return connection. Fig. 4 is a vertical transverse section through the boiler on the plane indicated by the dotted line 4 4 of Fig. 1. Fig. 5 is a vertical transverse section on the plane indicated by the dotted line 5 5 of Fig. 1, illustrating the combustion chamber and the smoke-pipe.

Like numerals of reference denote like and corresponding parts in each of the several figures of the drawings.

10 designates 'the jacket or shell of the steam-boiler, and to the ends of this jacket are united the heads or sheets 11 12.

\Vithin the boiler-shell, near one end thereof, is arranged a transverse flue-sheet 13, which is secured in the usual way to the jacket 10, and this flue-sheet'13 is parallel with the head 11 to provide a smoke box or chamber 13. The series of return-ii ues presently described are united to this flue-sheet 13 to discharge the heat and products of combustion into the smoke-box, and the stack 14 is united to the shell 10 for communication with the smoke-box tocarry off the products of combustion and establish the necessary draft in the boiler. At the opposite end of the boiler-shell I provide the back connectionsheet 15, which is shaped to lie partly concentric With the jacket or shell 10 and to present a flat upper side 15. The flue-sheet 16 is arranged transversely within the boiler parallel to the head 12 thereof and contiguous to the back connection-sheet 15, and this flue sheet 16 extends entirely across the jacket or shell for union therewith in the usual way. The back connection-sheet 15 is situated between the flue-sheet16 and the head 12, and this connection-sheet 15 forms within itself the back connection-chamber 19. The connection-sheet 1.5 is united at one edge, as at 17, to the flue-sheet 16, and its other edge is united, as at 18, to the head 12 of the boiler. Awater-chamber 20 is formed by and between the head 12 and the fluesheet 16, and this chamber 20 extends en tirely around the back connection-chamber 19 to maintain a proper supply of water around said connection-chamber and partic ularlyacross the flat upper side of the crownsheet 15. This sheet 15 is united to the jacket or shell of the boiler by the stay-bolts 21, which are fastened to the flattened crown of the sheet 15 and the jacket 10, and, if desired, I may use two or more series of these stay-bolts to reinforce the sheet 15.

In the construction of my improved boiler I employ a longitudinal main line 22 of large diameter, which extends from one end of the boiler to the back connection-chamber 19. This tube or fine 22 is disposed in the lower part of the jacket or shell, and it extends through the flue-sheet 13, one end of this large main flue 22 beingjoined with the head 11 and its opposite end united with the fluesheet 16, as clearly shown by Fig. 1. The tube or flue 22 is bent between the head 11 and the flue-sheet 13. to provide the side walls 23 at the lower part of the ash-pit, and these bent sides 23 of the main flue are united to the bottom part of the jacket or shell 10, as shown by Fig. 5. The employment of the large main flue 22 divides the jacket or shell between the flue-sheets 13 16 into the fluechamber 22 of large capacity, and through this chamber extends the plurality of longitudinal return flues ortubes 24. These tubes are arranged in series between the sides of the jacket 10 and the large main fine 22, and the ends of said return-fines are united in the ordinary way to the flue-sheets 13 16. The heat and products of combustion from the grates of the combustion-chamber circulate through the main fine 22, flow into the back connection-chamber 19 through the returnfiues 24, and are discharged into the smoke bOX or chamber, from whence they find their exit through the stack.

From the foregoing description, taken in connection with the drawings, it will be observed that the back connection-sheet and the flue-sheet 16 provide a water-chamber which surrounds the back connection-chamber and this water-chamber 20 does not have direct communication with the main flue-chamber 22, because the flue-sheet 16 cuts off such direct communication. This construction provides for the water contained in the chamber 20 to change its level irrespective of the corresponding change in the water-level in the main flue-chamber 22, as indicated by the dotted lines X Yin Fig. 1, whereby the proper supply of water is maintained in the chamber 20 to prevent exposure of the back connection-sheet 15 and to protect said sheet from the injurious effects of the heat which circulates through the chamber 19in its course from the main line 22 to. the return-fines 24. In the practical service of my boiler, the feed: water is forced or injected into the chamber 20, in which the feed-water is heated preliminarily to its introduction into the main chamber 22, and at the same time the mud and sediment are collected in-this chamber 20 to prevent its passage along with the water into the chamber 22 for accumulation on the return-fines 24, the main flue 22, and the jacket or shell of the boiler.

Communication between the chamber 20 and the main flue-chamber of the boiler is established by a water-overflow pipe and by a steam-pipe, whereby the water from the chamber 20 is permitted to pass through the overflow-pipe into the main flue-chamber, While the steam-pipe establishes uniform pressure in the two chambers of the boiler. The overflow-pipe 25 is arranged in a horizontal position within the chamber 20 above the crown of the back connection-sheet 15. One end of this overflow-pipe is fastened securely to the flue-sheet 16, while the other end of said pipe terminates in an upwardly facing elbow, forming an inlet-mouth 26. As this overflowpipe is situated above the crown of the back connection -,sheet and as the feed-water is supplied to the chamber 20, it is evident that water cannot be introduced into the main fine-chamber 22 except through the overflow-pipe 25, whereby the proper quantity of water is kept in the chamber 20 to prevent exposure of the sheet 15. The steam-pipe 27 is situated in the chamber 20 above the water-line in the boiler, and said steam-pipe is attached to the flue-sheet 16 to establish communication between the steam-spaces of the chambers 20 22, whereby the steam-pressure is uniform throughout the steam-spaces of the boiler.

In some types of boilers, particularly in boilers for traction-engines, I provide a mudcollecting drum 28, which is situated on the lower side of the boiler-shell in the vertical plane'of the back connection-chamber 19 and the water-chamber 20. The boiler'is provided with a hand-hole cover 29 for conveniently obtaining access to the sheet 15 and the drum may be equipped with a blow-off cock, as is usual in the art. A series of cleaning-openings 30 are provided in the head 12 of the boiler, and these openings are closed by the removable plugs 31, thus enabling the attendant to obtain access to the chamber 20 for cleaning the back connection-sheet and the flue-sheet 16.

At the end of the boiler having the smokestack I provide two sections of grate, (indicated, respectively, by the numerals 32 33,) and the. grate-section 32, which lies over the ash-pit, is of smaller area than the grate 33, which is contained within the boiler. These grates are supported within the main flue 22, and the inner grate-section 33 is upheld by the bridge 34, suitably fastened to the flue 22. The contiguous ends of the grate-sections are carried by the intermediate bar 35, which is fastened to the inner shell or fine 22, and from this bar is suspended the draftdamper 36, which is hinged or pivoted to the bar, as shown.

The boiler is equipped with the usual steamdrum 37, and the feed-water is supplied to the chamber 20 by the inlet-pipe 38, which is suitably attached to the boiler for communication with the chamber 20.

It is evident that parts of my improvements may be employed in the practical construc tion of steam-boilersas, for instance, the mud-drum and the cleaning appliances may be omitted and that other devices than the particular construction of the grates may be used in the inner shell 22. The mud-drum 28 is advantageous, however, in the construction of boilers for traction'engines, and this mud-drum may serve as the means for the attachment of the king-bolt, by which one en d of the boiler may be mounted on an axle of a traction-engine.

Changes may be made in the form of some of the parts, while their essential features are retained and the spirit of the invention embodied. Hence I do not desire to be limited to the precise form of all the parts as shown, reserving the right to vary therefrom.

The longitudinal main flue 22 is tapered somewhat in the direction of its length, so that the end which contains the grate is larger in cross-section than the end which is united to the back connection-sheet, and thus the flue 22 may be united to the back connectionsheet to give more room on the sheet 15 for the attachment of the return-tubes. These return-tubes may thus be attached to the backconnection-sheetwithoutcrowding. The return-tubes and the upper side of the tapered main flue are sloped or inclined from the front flue-sheet to the back connectionsheet, thus submerging one end of the tubes in the water to a greater depth than the other end and also allowing the tubes to be covered for a longer period when the boiler is carried upgrade.

What I claim is- 1. In a steam-boiler, the combination with a back connection-chamber, and a main flue communicating therewith,ofafiue-sheet fixed within the boiler-shell parallel to one of the heads thereof and forming with said head a water-chamber which surrounds the back connection-chamber, return-tubes united to the flue-sheet to communicate with the back connection-cha1nber, and an overflow connection between said surrounding water-chamber and the boiler-chamber in which the return-tubes are located, substantially as described.

2. A steam-boiler provided around its back connection with a water-chamber which is isolated from the main flue-chamber, an overilow connection between said water-chamber and the main flue-chamber, and a steam con-' In a steam-boiler, the combination with a back connection-chamber, of a tapering main flue communicating with said chamber, a flue-sheet united to the main flue and forming a waterchamber which surrounds the back connection chamber, the inclined return-tubes united to the flue-sheet and communicating with the back connection-chamber, a water-overflow pipe supported by the flue-sheet above the return-tubes, and a steam connection between the water-chamber which surrounds the back connection-chamber and the boiler-chamber in which the return-tubes are located, substantially as described.

4. In a steam-boiler, the combination of a back connection-sheet united to a boiler-head, a fiue-sheet secured to the boiler-jacket and the back connection-sheet to provide a waterchamber around the back connection-sheet, an overflow-pipe in the surrounding waterchamber and attached to the flue-sheet and a steam-pipe also attached to a flue-sheet to establish communication between the steamspaces of the water-chamber and the mainflue chamber, substantially as described.

5. In a steam-boiler, the combination of a back connection-sheet, a flue-sheet united to the boiler-jacket and said back connectionsheet to form a water-chamber, a mud-drum situated in a vertical plane of the back connection-chamber and communicating with the water-chamber,clean-out devices on the boiler in communication with said water-chamber, and an overflow connection from the waterchamber to the main-flue chamber, substantially as described.

6. In a steam-boiler, the combination with a jacket and the heads thereof, of the fluesheets united to the jacket, a back connectionsheet united to one of the heads and fluesheets and forming therewith an isolated water-chamber, an inner shell or flue extending through one of the flue-sheets and having its ends united to one of the heads and the other flue-sheet, and return-fines united to the two flue-sheets between the jacket and the inner shell or tube and communicating with the chamber of the back connection-sheet, substantially as described.

7. A steam-boiler comprising the jacket having the heads, the internal flue-sheets, a back connection-sheet united to the head and flue-sheet at one end of the boiler, an inner shell or tube of large diameter extending through one flue-sheet, united to one head and the other flue-sheet to open into the back connection-chamber, and having bent portions at one end united to the jacket to form the side walls of the ash-pit, a grate supported within the internal shell or tube, and return flues joined with the flue-sheets, substantially as described.

8. In a steam-boiler, the combination with a shell, a front flue-sheet, and a back connectionsheet, of a longitudinally-tapered main flue united to the shell, extending through the front flue-sheet, and attached to the back con- IIO nection-sheet for its upper side to lie below my own I have hereto affixed my signatnrefin the line Where'the front flue-sheet joins with the presence of two Witnesses. the corresponding side of the main flue, the inclined return-tubes united to the two sheets, H SANDQUIST' 5 and the grate within one end of the main flue,- Witnesses:

substantially as described. FRANK SWANSON,

In testimony that I claim the foregoing as LEWIS A. SKIFSTROM. 

